The Home Secretary also revealed extremists on a Government hit list will be rounded up in "the next few days".

Mr Clarke issued a list of "unacceptable behaviour" which will be used to kick out or ban those inciting or glorifying terrorism. He said: "There still remain people who are on the edge of illegality who we believe it is right to be able to exclude from this country."

Tory leadership contender David Cameron yesterday backed the powers but civil rights groups warned deportees could be at risk. Liberty said: "What separates us from terrorists is we don't torture or send people to be tortured."

And the UN's special representative against torture, Manfred Nowak, condemned the Government for trying to get assurances from countries such as Algeria that torture would not be used, saying it demonstrated there was a risk.

Mr Clarke hit back by saying the rights of terror victims were more important than protecting criminals.

Massoud Shadjareh, of the Islamic Human Rights Commission, said the list made a "mockery" of consultations as objections had been ignored.

Supporters of Egyptian-born cleric Abu Hamza - who is in jail fighting an extradition warrant from the US - vowed the new rules would not stop them "honouring" terrorists.